Compartmentalization

whether public or private sector, compartmentalization of information means to limit access to information to persons who directly need to know certain such information in order to perform certain tasks

Compartmentalizing is the act of splitting an idea or concept up into (sometimes more or less arbitrary) parts, and trying to enforce thought processes which are inhibiting attempts to allow these parts to mix together again in an attempt to simplify

a term from structures

The idea is to subdivide a structure into "fire compartments", which may contain single or multiple rooms for the purpose of limiting the spread of fire, smoke and flue gases, in order to enable the three goals of fire protection